how to avoid add attachments from inbound mail action

[String]

Hi Team ,

we have written inbound mail action as below :

var messageContent = "[code]" + email.body_html ;
if (messageContent.indexOf("From") != -1) {
messageContent = messageContent.substring(0, messageContent.indexOf("From")).trim();
} else {
messageContent = messageContent.trim();
}

current.work_note = messageContent;
current.update();

when the user replies from the mail, we are updating the same in the work note,but along with that ...phone icon, Twitter icons also inserted into attachments(which is there in the user signature). how to avoid that those icons not to insert into attachments 

user reply as below:

Hi team,

Please update my comments 

Kind Regards,
ABC

Do you have a question? We can help.

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[Ankur Bawiskar]

@String 

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Thanks!
Ankur